单项选择题

The passage is mainly about ______.

A．the composition of environment
B．the impact of environment on human
C．the impact of human on environment
D．the causes of environmental problems
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单项选择题
The ingredient of atmosphere does NOT include ______.
A．carbon dioxide
B．dust particles
C．water vapor
D．sunlight
单项选择题
Why had nearly a million people come to watch the launch of Apollo 11
A．They had come to intensify the excitement.
B．They just wanted to show their support for the national project.
C．It was mankind’s first attempt to land on the moon and no one wanted to miss the historic event.
D．They didn't believe the mission would succeed.
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